Immortality: Grail is immortal, she does not age and cannot be killed by any conventional means.

Omega Beams: Grail inherited, or has a power similar to, the Omega Effect of her father. Capable of injuring the likes of the New Gods, and destroying the unbreakable bracelets of Wonder Woman.

Dimensional Travel: Grail has the ability to lock on the frequency of those connected to the Speed Force and use them as bridges to cross universes.

Will Corruption: Grail can infect and corrode the emerald energy of willpower emanated from the Green Lantern Rings, causing great harm and pain to the ring wielder.

Summoning: Grail can use a twisted Amazon ritual that imprisons the darkness in one's heart to summon her father Darkseid to wherever she is.

Scythe: Through unknown means grail has acquired a weapon shaped new god computer similar to Kanto's.

Origins:

Grail is the daughter of Darkseid, prophesied to cause great destruction at the behest of the Anti-God.

At the same time as the birth of Diana to Hippolyta, the Amazonian assassin Myrina gave birth to the daughter of Darkseid in secret, aided by Penelope and watched by the oracle Menalippe. Upon the birth of the young girl, Grail was defended by her mother from Penelope, who heard of the prophecy from Menalippe of the destruction that would be caused by the girl when she grew. After murdering Menalippe, Myrina fled Themyscira, bringing her daughter with her as the first Amazons to leave the island.

Decades later, Grail allied with the Anti-Monitor and aided him in declaring war on her father.